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Anoxygenic photosynthesis is a special form of photosynthesis used by some bacteria and archaea, which differs from the better known oxygenic photosynthesis in plants in the reductant used (e.g. hydrogen sulfide instead of water) and the byproduct generated (e.g. elemental sulfur instead of molecular oxygen). Like oxygenic photosynthesis, anoxygenic photosynthesis uses the Calvin cycle to convert carbon dioxide and hydrogen-carrier compounds into glucose.